Cable-car truck



(No Model.)

S. A. BEMIS.

CABLE OAR TRUCK.

No. 388,811. Patented Sept. 4, 1888.

UNITED STATES PATENT OFFICE.

SUMNER A. BEMIS, OF SPRINGFIELD, M ASSA OIIUSETTS.

CABLE-CAR TRUCK.

SPECIFICATION forming part of Letters Patent No. 388,811, dated September 4, 1888.

(No model.)

To all whom it may concern.-

Be it known that I, SUMNER A. BEMis, a citizen of the United States, residing at Springfield, in the county of IIampden and State of Massachusetts, have invented new and useful Improvements in Oar-Trucks, of which the following is a specification.

This invention relates to cable-car trucks, the object being to provide in cars of this class improved pivoting mechanism between the car and the truck, whereby the latter is permitted to swing in a horizontal plane under the car-body in passing around curves, the invention being in the nature of an improvement upon my patent of November 1, 1887, No. 372,293, to which reference may be had.

In the drawings forming part of this spccifieation, Figure 1 is a plan view of a eartruck having car-pivoting devices attached thereto embodying my improvements, said figure having indicated thereon in dotted lines the outline and position of a portion of the floorframe of a car and frictionrollers on said frame located opposite the sides of a pivotring on the truck. Fig. 2 is a section of Fig. 1 on line a: w in that figure, showing a portion of the car-truck and of the floor of the car.

I11 my patent above referred to the cylindrically-shaped eenterbearing constituting the pivot-ring, so to speak, of the construe tion therein shown, consists of two separate segmental parts, each attached to the floortimbers of the car, and having their lower ends pending beneath the same, the said pending ends entering a frame on the truck.

The object of this invention is to improve the pivoting mechanism between the truck and the car, as hereinafter described, thereby simplifying the same and making it stronger and more capable of resisting the strain upon said pivot parts when cable-ears are run at high speeds around curves.

In the drawings, 2 indicates the truck-frame, ordinarily of iron, which is hung upon the journals of the axles 3 through the intermediary of the usual axle-boxes, 4. To said truck-frame 2 are secured by their ends two transverse parallel trusses, 5, extending in lines with said axles, and to said trusses 5 are secured by their ends two parallel shorter trusses, 6, at right angles to said trusses 5. To the upper sides of said trusses 5 and 6 are rigidly bolted by one end a series of metal clips, 7, to whose upwardly-projecting ends the continuous pivot-ring 8 (preferably of wrought-iron) is bolted, and is thereby supported with its sides in a vertical plane, as shown. The said ring-supporting clips 7 have their upstanding ends bolted to the inner side of said ring in order to leave its exterior surface entirely free for the engagement therewith of the peripheries of a series of frictionrolls, as below described. The pivot-ring is thus rigidly fixed in a central position on the truck-frame.

To the frame-work of the car-floor (indicated by dotted lines in Fig. 1, and shown in section in Fig. 2) are rigidly bolted a series of metallic roller-supports, 9, within each of which a friction-roll, 10, is hung to rotate freely in a horizontal plane, and said rolls are so set that their peripheries have a free engagement with the outer side of said pivotring 8. The positions of said rolls 10 relative to said ring are clearly indicated in dotted lines in Fig. 1. A frictional bearingwheel, 12, is hung in a suitable frame supported on the ear-truck frame on the opposite sides of said pivotring 8, as shown in Figs. 1 and 2, said frietion wheels being so located that the timbers of the floor of the car 13 have a bean ing thereon and the weight of the car is sup ported thereby. Said wheels 12 have a slight reciprocating rotary motion during the swinging movement of the ear-truck under the car, while the latter is guided by the pivot-ring 8 and the frictionrolls 10, located outside ofsaid ring.

Under each end of each of the frames 14, in which the aforesaid frictioirwhecls 12 are hung, is placed a spring, 15, (see Fig. 2,) whereby ease of motion is imparted to the car, which rests upon said Wheels. The motion of the car, which is permitted by the said bearing-springs 15, causes a vertical motion to be imparted to the frietioirrollers 10 opposite the adjoining side of the pivot ring 8, and therefore said ring is supported by the clips 7, secured to the inner side of said ring, thereby leaving the outer side clear and unobstructed to permit said spring motion of the car without interfering with the mechanism which supports said pivot-ring.

That I claim as my invention is A cartruek having its pivotring rigidly secured to the trueivfranic, combined with a, ear-body having its floor extending wholly over said ring, and a series of frietion-rolls hung to the under side of said floor to rotate in a horizontal plane with their peripheries 1c opposite the outer side of said ring, substantially as set forth.

SUMNER A. BEMIS. Witnesses:

H. A. CIIAPIN, G. M. CHAMBERLAIN. 

